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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Effect of oral melatonin administration on melatonin, 5-hydroxyindoleacetic acid, indoleacetic acid, and cyclic nucleotides in human cerebrospinal fluid.

Melatonin was given orally to patients undergoing diagnostic pneumoencephalography and various compounds were measured in the lumbar and cisternal CSF. Melatonin markedly increased plasma and CSF melatonin concentrations. The plasma: CSF melatonin ratios were similar in patients who received, and in those who did not receive, melatonin. This supports the idea that melatonin is released from pineal to blood and gets into the CSF via the blood. Melatonin did not affect CSF 5-hydroxyindoleacetic acid, which indicates that it has no effect on 5-hydroxytryptamine metabolism. Melatonin increased CSF indoleacetic acid significantly, indicating increased metabolism of tryptamine. Melatonin did not affect CSF cAMP levels, but increased cGMP levels. The effect on indoleacetic acid and cGMP was seen in both lumbar and cisternal CSF, suggesting that melatonin can have generalized actions throughout the CNS.[1]


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